Anslow, described by police as "extremely dangerous", escaped when the vehicle was ambushed by three masked men earlier in the day.
They smashed windows with sledgehammers and punched the driver, who was taking inmates from Hewell Prison in Redditch, Worcestershire, to Stafford Crown Court.
Anslow is now at the centre of an international manhunt and police are offering a £10,000 reward for information leading to his capture.
Officers have searched properties in the Tipton area of the West Midlands, where Anslow comes from.
Meanwhile, further search warrants have been executed at two homes in the Tipton area. Property recovered from these addresses are being examined.
Det Supt Martin Evans, who is overseeing the inquiry, said: "We're continuing to follow several lines of inquiry as our investigation continues.
"We're hoping that the offer of this sizeable reward will encourage friends or associates of Anslow - or anyone else who knows where he is - to come forward with information."
Justice Secretary Kenneth Clarke has ordered an inquiry into how Anslow was able to escape custody.
Detectives have said the raid was well planned and executed. An abandoned silver Volkswagen Scirocco was found near the scene.
His security status was upgraded to category A last week after he was charged with the murder of businessman Richard Deakin.
However, he was not being transferred in a high-security prison service van - instead he was with other inmates in a vehicle run by a private contractor.
Anslow, also known as Skitz, is the first category A prisoner to escape from custody in more than 17 years.
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